Don't know the whole story, but don't worry about PDC - it stand for programme delivery control, which is a bit like videoplus. I think - tho I am not sure - it means that if a programme is late or early, then it still starts to record, and more importantly, ends at the end of the programme, not before.
ANYWAY.... you say it's recording all right but no pictures. If that's the case it's probably a very simple thing - make sure your scart leads are fully plugged in. I have had situations in the past where it has been knocked just a smidgin, so that it all seems OK, but it was that all the time. Try it anyway.